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I went through this issue last year with my MT-643 Allison recomends transynd in the over the road trucks that are driven commercially. These trucks can be driven more in one week than our trucks are driven in an entire year. The main advantage of the transynd is the increased service...

Where did you find this information. I could not find it on the allison website. I did find this and several other manuals that reccomend transynd, dextron III or C-4 for the AT 500 and MT 600 serires transmissions. Here is the link...